<!-- TRIGONAL P321 SPACE GROUPS -->
<input type="checkbox" name="spacegroups[]" id="sg_P321" value="P321"> P321<br/>
<input type="checkbox" name="spacegroups[]" id="sg_P3121" value="P3121"> P3121<br/>
<input type="checkbox" name="spacegroups[]" id="sg_P3221" value="P3221"> P3221<br/>
